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NEW INSTALLATIONS
Example circuit diagrams for some typical installations are shown below. These diagrams are
schematic and should be used as a guide only.
Please ensure that all installations comply with the current IEE regulations.
For reasons of space and clarity not every system has been included and the diagrams have been
simplified, for instance some Earth connections have been omitted.
Other control components shown in the diagrams i.e. Valves, RoomStats etc are general
representations only. However the wiring detail can be applied to the corresponding models of most
manufactures e.g. Horstmann, Honeywell, Danfoss Randall, ACL Drayton etc.
Cylinder and Room Thermostat Key:
C = Common CALL = Call for heat or break on rise
1. Typical combination boiler installation with RoomStat
3.Gravity primary with pumped Heating via
RoomStat and CylinderStat
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SAT = Satisfied on rise N = Neutral
2.Fully Pumped System with RoomStat and two port
spring return valve (with auxiliary switch) on
Heating circuit
4. Typical combination boiler installation
ELECTRICAL CONNECTIONS
CentaurPlus programmers are double insulated and do not require an Earth connection but an Earth
connection block is provided on the Backplate for terminating any cable Earth conductors. Earth
continuity must be maintained and all bare Earth conductors must be sleeved. Ensure that no
conductors are left protruding outside the central space enclosed by the Backplate.
INTERNAL WIRING DIAGRAM C11 - C17
Your CentaurPlus has Voltage
Free contacts.
A link L - 2 is required for
mains Voltage applications.
COMMISSIONING THE PROGRAMMER
Ensure all dust and debris has been cleared away from the work area before removing the
programmer from its packaging. All CentaurPlus controls are fitted with battery reserve which will
maintains programmed times in the event of a mains power failure.
REAR VIEW OF CENTAURPLUS PROGRAMMER
BATTERY RESERVE
The Battery must be commissioned prior to fitting the control to the Backplate. This is achieved by the
means of a COMMISSIONING STRIP situated on the back of the unit. Pull out the battery commissioning
strip at the back of the programmer and re-insert the Battery, the reserve is now activated.
When the programmer is running on battery reserve the clock display will disappear. This is to prolong
the life of the battery.
1 - RATINGS LABEL
2 - BATTERY
3 - CONNECTOR PINS
4 - PRODUCTION DATE LABEL
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